Tool holder arrangement

Claim 1

A TOOL HOLDER FOR USE WITH AN INSERT WHICH COMPRISES A BODY IN THE FORM OF A REGULAR POLYGON HAVING A CENTRAL CYLINDRICAL HOLE EXTENDING THERE THROUGH, SAID TOOL HOLDER COMPRISING A SHANK, A PORTION OF REDUCED THICKNESS AT ONE END OF SAID SHANK, SAID PORTION OF REDUCED THICKNESS DEFINING A BASE FOR RECEIVING AN INSERT, AND A PAIR OF SIDE WALLS AT THE JUNCTION OF SAID BASE AND REMAINDER OF SAID INSERT, SAID SIDE WALLS BEING INCLINED AT AN ANGLE EQUAL TO THE ANGLE BETWEEN ADJACENT SIDES OF AN INSERT, A SCREW-THREADED BORE EXTENDING INTO SAID BASE, A SCREW-THREADED PIN ENGAGED IN SAID BORE AND HAVING AN EXTENSION OF TRUNCATED CONICAL FORM EXTENDING FROM SAID BORE INTO SAID CYLINDRICAL HOLE IN SAID INSERT, THE AXIS OF SAID BORE EXTENDING AT AN ACUTE ANGLE TO THE AXIS OF SAID HOLE IN SAID INSERT, SAID TRUNCATED-CONICAL EXTENSION MAKING LINE CONTACT WITH THE HOLE IN SAID INSERT, AND AXIAL MOVEMENT OF SAID PIN CLAMPING SAID INSERT AGAINST SAID SIDE WALLS.